[PATCH 1/3] libvirt-guests: detect invalid arguments

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Reject extra arguments.
Return the correct status for unknown arguments, as mandated by
https://fedoraproject.org/wiki/Packaging/SysVInitScript
Add --help, as a permitted extension.

* daemon/libvirt-guests.init.in (usage): New function.  Use it in
more places, and return correct value.
---
 daemon/libvirt-guests.init.in |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/daemon/libvirt-guests.init.in b/daemon/libvirt-guests.init.in
index d2ec96a..3a5b205 100644
--- a/daemon/libvirt-guests.init.in
+++ b/daemon/libvirt-guests.init.in
@@ -282,8 +282,21 @@ gueststatus() {
     done
 }

+# usage [val]
+# Display usage string, then exit with VAL (defaults to 2).
+usage() {
+    echo $"Usage: $0 {start|stop|restart|force-reload|gueststatus|shutdown}"
+    exit ${1-2}
+}
+
 # See how we were called.
+if test $# != 1; then
+    usage
+fi
 case "$1" in
+    --help)
+        usage 0
+        ;;
     start|stop|gueststatus)
         $1
         ;;
@@ -304,8 +317,7 @@ case "$1" in
         stop
         ;;
     *)
-        echo $"Usage: $0 {start|stop|restart|force-reload|gueststatus|shutdown}"
-        exit 3
+        usage
         ;;
 esac
 exit $RETVAL
-- 
1.7.2

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